Dry shaver with oscillating comb head and a rotating inner cutter



July 28, 1964 MAREscALcHl 3,142,118

DRY SHAVER WITH OSCILLATING COMB HEAD AND A ROTATING INNER CUTTER Filed 001'.. 9. 1961 INVENTOR Luci. om o M avescqlch BY @u @Bent United States Patent O 3,142,118 DRY SHAVER WITH OSCILLATING COMB HEAD AND A RO'IATING INNER CUTTER Luciano Marescalchi, Dr. Guido Modiano, Via Meravigli 16, Milan, Italy Filed Oct. 9, 1961, Ser. No. 143,612k Claims priority, application Italy Oct. 12, 1960 1 Claim. (Cl. 30-43) This invention relates to dry shavers which are powered by an electric motor and which are provided with a shearing head, said electric motor driving a cutting means within a comb which forms a part of said shearing head. More particularly, this invention relates to dry Shavers in which the shearing head performs oscillatable movements around an axis which is perpendicular to the shaving surface and to the skin to be shaved, as disclosed in U.S. Patent No. 2,920,387, issued to Luciano Marescalchi.

The main object of the present invention is to provide driving means for causing the shearing head to oscillate, which driving means give raise to a soft engagement, along large radius curved surfaces between the driving and the driven elements respectively of said driving means, so as to ensure a smoother working and higher speeds of the dry shaver itself.

A further object is to provide driving and driven elements which are simple to manufacture, in assembling and in operation, thus enhancing the constructive performances and the eiiiciency of the dry shaver.

Further objects, features and advantages will be more apparent from the `description of a preferred embodiment, which is illustrated, by way of example only, in the accompanying drawing, wherein:

FIG. l is a side sectional view of a dry shaver according to the invention, wherein the relevant parts are markedly shown, whilst some conventional parts are either represented by dotted lines or omitted at all for claritys sake.

FIG. 2 is a horizontal sectional view along lines II- II of FIG. 1.

Referring now more particularly to the drawing, the dry shaver comprises a casing 1 housing a driving means in the form of an electrical motor 2, the driving shaft 3 of which has an end 4 carrying the cutting means (not shown), arranged below and adjacent the comb or shaving net 5, which forms the surface in contact with the skin to be shaved, the comb and the cutting means forming an oscillatable head, as`will be seen. The comb 5 is carried by the cap or head 6, which is mounted on the casing 1 so as to be capable of rotating on the same. Screws 7 or any other slidable means, which cross the cap or head 6 and engage within the circumferential slot 8 of the casing 1, provide for said cap or head being rotatable on the casing 1, but being prevented from being axially removed from said casing. A pinion 9 is keyed on shaft 3, said pinion meshing with the two toothed wheels 10 and 11, which are symmetrically arranged with respect to said pinion along a diameter included in a vertical section of the shaver casing 1. Wheel 11 meshes in turn with a toothed wheel 12 arranged on the same diameter as that hereinabove mentioned.

To the toothed wheels 10 and 12, two semicircular sectors respectively, which are marked by reference numerals 13 and 14 are coaxially secured. The tirst sector 13 is intended for frictional engagement with a iirst rim 15, which is integral with the cap 6, whilst in turn the second sector 14 is intended for frictionally engaging a second rim 16, which is also integral with cap or head 6.

For reasons of movement symmetry, it is preferred that the transmission ratio between sector 13 and rim 15 is equal to the transmission ratio between sector 14 and rim 16.

3,142,118 Patented July 28, 1964 lCev To this end it will be necessary that the radius of the sector 14sbe larger than the radius of sector 13 since the radius of the rim 16 is for constructive requirements (as is apparent from FIG. 2) larger than that of rim 15. In the embodiment, in order that the two aforesaid transmission ratios may be equal it will be necessary that the ratio between the radius of sectors 13 and 14 be equal to that of the radius of rims 15 and 16.

To complete the description with more details, it may be mentioned that between the top portion of casing 1, which top portion has a smaller cross size and thus forms a shoulder 1a, and a ring 1b secured to the inner wall of said casing, a plate 1c is arranged, in upper recesses 0f which the frames 10a, 10b and 12a, 12b respectively are partially housed. Starting from the upper part of these frames and across themselves, a first driven shaft 13a and a second driven shaft 14a extend in parallel relationship with the driving shaft 3. On these shafts 13a and 14a the units consisting of wheel lil-sector 13 and Wheel 12-sector 14 are respectively mounted, so that these units may rotate each as a single member.

The top part 6a of cap 6 is secured in a removable manner, in 17 to the remaining part of the cap, in order t0 allow the cutting means to be cleaned.

The working of the shaver is as follows:

Assuming that the rotation direction of the driving shaft 3 and of the pinion 9 is anti-colckwise and assuming that the position of the different transmission members corresponds to that of FIG. 2, it will be observed that wheel 10 will rotate clockwise along with sector 13, which, in the assumed moment, is not in contact with the rim 15. The wheel 11, in turn will rotate clockwise and will drive in anti-cockwise direction the wheel 12 and the sector 14.

In this moment the sector 14 is in contact with the rim 16 thus compelling this rim to be moved anti-clockwise taking along therewith, in the same direction, also the comb carrying means and consequently the comb 5.

The motion of the rim 16 will continue as long as there will be a contact with the sector 14 (a quarter of the revolution of the sector if the motion starts from the moment represented in the drawing and if the sectors are of semi-circular shape).

Either in the moment in which (whilst continuing the rotation of the shaft 3) the contact between the rim 16 and the sector 14 is interrupted or after a more or less long halt, a contact between sector 13 and rim 15 is established.

The sector 13, which rotates clockwise will compel now the rim 15 to be rotated also clockwise, taking therewith also the cap 6 and the comb VV5. If the sector is semicircular in shape the contact thereof with the rim 15 will have the amplitude of half a revolution of the sector.

In virtue of the alternate sequence in which the sectors are coming into contact with the rims 15 and 16, the movement of the cap and of the comb 5 will be alternately clockwise and anti-clockwise with an inversion frequency which is proportional to the own rotation frequency of the driving shaft 3.

It is obvious that the amplitude of rotation of cap 6 will depend exclusively from the transmission ratio between sector and rim and may be changed at will by Varying this same transmission ratio. According to an advantageous feature, in order to have a short halt phase between one oscillation and the successive antagonist one, the amplitude of sector 13 and 14 is limited to a portion which is less than the semi-circular one. In this manner when the contact between one of the two sectors and the corresponding rim is interrupted, the other sector does not come immediately into contact with the respective rim, since it has to be still more rotated along a certain angle before the contact is coming into being. In this manner,

the harmful effect is reduced, which is imparted upon the device as a consequence of the abrupt inversion of the rotation.

I wish it to be understood that I do not desire to be limited to the exact details of the exemplification of construction shown and described, for obvious modications will occur to a person skilled in the art.

I claim:

A dry shaver comprising a casing, a head disposed on said casing and including a comb having a skin contacting shaving surface and inner cutting means disposed in said comb, said head being oscllatable about an axis extending in the longitudinal direction of said casing at right angle to the skin contacting shaving surface of said comb,

driving means operating said cutting means including a 15 driving shaft extending in said longitudinal direction 01: said casing and having an axis coinciding wth said longitudinal axis, a irst and a second driven shaft parallel to and driven by said driving shaft, a first circular sector secured to said rst driven shaft and a second circular sector secured to said second driven shaft, a rst rim integral with and projecting from said head towards said rst sector, to be frictionally engaged thereby and a second rim integral with and projecting from said head towards said second sector to be frictionally engaged thereby, said first sector and said second sector having an angular amplitude of tendentially 180 degrees.

References Cited in the file of this patent UNITED STATES PATENTS 2,308,920 Horowitz et al Jan. 19, 1943 2,396,181 Kerwer Mar. 5, 1946 2,965,966 Jacobs Dec. 27, 1960 FOREIGN PATENTS 571,355 Italy Jan. 2, 1958 

